Physics Work/Power/Energy

The unit of work is the

• Newton

• Watt

• JJ Watt

• Joule

If you lift one 400 N load up two stories, how much work do you do compared to someone else lifting one load up one story.

• four times as much

• the same

• half as much

• twice as much

Raising a car on a jack requires work. Raising it in 1/4 the time requires:

• half the power

• the same power

• twice the power

• four times the power

A truck traveling at 10 km/h has kinetic energy. How much does it have when its speed is increased to 40 km/h?

• 4 times the KE

• the same KE

• 8 times the KE

• 16 times the KE

Tags

NGSS.HS-PS3-2

A boulder at the top of a vertical cliff has a potential energy of 500 J relative to the ground below. It rolls off the cliff. When it is halfway to the ground its kinetic energy is

• the same as the potential energy at that point

• negligible

• about 600 J

• about 100 J

Tags

NGSS.HS-PS3-1

A boulder is raised above the ground so that its potential energy relative to the round is 400 J. Then it is dropped. What is its kinetic energy just before it hits the ground.

• 200 J

• 400 J

• 600 J

• 800 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

In Physics power is defined as:

• force divided by time

• KE divided by time

• Coach Sebits' serve in tennis

• work divided by time

Gravitational potential energy is the energy an object has because of its:

• temperature

• energy stored in chemical bonds

• postion

• speed

Tags

NGSS.MS-PS3-2

The amount of potential energy possessed by an elevated object is equal to

• Work done lifting it straight up

• The force needed to lift it

• the distance it is lifted

• the power used to lift it

Approximately how much does a 5 kg rock weigh?

• 5 kg

• 500 N

• 50 kg

• 50 N

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4